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		<span class="header-logo header-affix margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Usaco2008 Open]Crisis on the Farm 牧场危机</span>
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                [Usaco2008 Open]Crisis on the Farm 牧场危机                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><div><span style="font-size: medium">约翰和他的奶牛组建了一只乐队&ldquo;后街奶牛&rdquo;，现在他们正在牧场里排练．奶牛们分成一堆一堆，共N(1&le;N&le;1000)堆．每一堆里，30只奶牛一只踩在另一只的背上，叠成一座牛塔．牧场里还有M(1&le;M&le;1000)个高高的草垛．&nbsp;作为出色的指挥家，约翰可以通过口哨指挥奶牛们移动．他的口哨有四个音，分别能使所有的牛塔向东南西北四个方向移动一格．</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;每一次，当一个牛塔到达了一个草垛所在的格子，牛塔最上方的奶牛就会跳到草垛上，而且不再下来，而其他奶牛仍然呈塔状站在草垛所在的格子里．当牛塔只剩一只奶牛时，这只奶牛也会跳到草垛上．&nbsp;突然，约翰大惊失色：原来邻家的奶缸爆炸了！滚滚而下的牛奶正朝着约翰的牧场冲来，不久就要将牧场淹没．约翰必须马上行动，用口哨声挽救奶牛们的生命．他要指挥奶牛尽量多地跳上草垛，草垛上的奶牛将不会被淹死．&nbsp;&nbsp;&nbsp;&nbsp;约翰还有K次吹口哨的机会．那他最多还能救多少奶牛呢？请计算最多能挽救的奶牛数，以及达到这个数目约翰需要吹的口哨调子序列．序列用E，W，S，N表示东西南北．如果有多种序列能达到</span></div>
<div><span style="font-size: medium">要求，输出作为字符串最小的．</span></div></p><hr/><h3>输入格式</h3><p><div></div>
<div></div>
<div></div>
<div>
<div>第1行输入三个整数N，M，K，之后N行每行输入一对整数(Xi，Yi)表示一座牛塔所在的位置，1&lt;=K&lt;=30</div>
<div>之后M行每行输入一对整数(Xi，Yi)表示一个草垛所在的位置．1&le;Xi&le;1000;1&le;Yi&le;1000.</div>
</div>
<p></p></p><hr/><h3>输出格式</h3><p><div>&nbsp;</div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第1行输出最多能挽救的奶牛数．第2行输出口哨调子序列．</span></div></p><hr/><h3>样例输入</h3><pre>3 6 3 
3 4 
6 2 
5 7 
8 2 
9 2 
6 4 
5 4 
6 7 
8 7 


</pre><hr/><h3>样例输出</h3><pre>Use the 'east' whistle three times, at which point the milk floods
the area.  Each haystack ends up saving 1 cow.

6 
EEE 
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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